/**
     *gets tracking code based on campaign
     *@return tracking javascript for pardot api
     */
    public static function GetPardotTrackingJs()
    {
        $html = false;
        $campaign = PardotConfig::getCampaignCode();
        if ($campaign) {
            $tracker_cache = SS_Cache::factory('Pardot');
            if (!($tracking_code_template = $tracker_cache->load('pardot_tracking_code_template'))) {
                $api_credentials = PardotConfig::getPardotCredentials();
                $pardot = new Pardot_API();
                if (!$pardot->is_authenticated()) {
                    $pardot->authenticate($api_credentials);
                }
                $account = $pardot->get_account();
                if (isset($account->tracking_code_template)) {
                    $tracking_code_template = $account->tracking_code_template;
                    $tracker_cache->save($tracking_code_template, 'pardot_tracking_code_template');
                }
            }
            $tracking_code_template = str_replace('%%CAMPAIGN_ID%%', $campaign + 1000, $tracking_code_template);
            $campaign = $campaign + 1000;
            $html = <<<HTML
<script> type="text/javascript">
piCId = '{$campaign}';
{$tracking_code_template}
</script>
HTML;
        }
        return $html;
    }
 /**
  *checks current pardot api credentials  
  *@return string api key if valid, empty string if non-valid
  */
 public static function validApiCredentials()
 {
     $pardot = new Pardot_API();
     return $pardot->authenticate(self::getPardotCredentials());
 }